full stack javascript engineer jobs in London

Crisil is seeking a Senior Full Stack Engineer to build and support market data platforms in a Global Markets context. You will work on end-to-end solutions across UI, APIs and data layers to support data analytics, distribution and usage workflows.The role requires strong full-stack experience, exposure to market data systems and the ability to operate in...

Gazelle Global Consulting Limited is hiring a Full Stack Python Developer for a 12-month contract in London with hybrid work (3 days onsite). You will work across backend and frontend, building scalable Python/Flask services, REST APIs and modern JavaScript applications.You’ll collaborate on full-stack development, integration, deployment and production...

IFS is adopting cutting-edge AI-driven industrial emissions solutions and is seeking a Lead Software Engineer to shape scalable cloud-native platforms. The role spans front-end and back-end work with React and GoLang, emphasizing API-first design, reliability, and DevOps practices.You will lead technical decisions, mentor engineers, and collaborate across...

Runna is building the #1 training platform for runners in London. We’re hiring a Staff Software Engineer (Full Stack) to provide architectural direction across multiple squads and drive engineering excellence in a fast‑paced, mission‑driven environment.You’ll mentor engineers, define scalable solutions, champion AI in our SDLC, and own end‑to‑end...

Viasat is seeking a highly skilled Full-Stack Engineer to join our data-driven product team. You will develop and shape platform ecosystems, build web portals, automated document systems, and cloud applications that process billions of records.You’ll contribute to architectural decisions, integrate BigQuery data pipelines, Salesforce, and enterprise...

ARC IT Recruitment is partnering with a fast-growing marketplace tech business in Greater London to hire a frontend-focused developer. You will start with a strong React emphasis, working on high-traffic features and state management, with a clear pathway toward a balanced React/Node.js stack.A mobile app is on the roadmap, offering future expansion...

Hawksworth is recruiting a Full Stack AI Engineer to join a growing technology company building a new AI-native digital platform for the Energy and Oil & Gas industry. This is a hands-on role working on a platform that will integrate with some of the world’s largest Energy organisations.We’re seeking an experienced Full Stack Engineer with strong modern...

Runna is seeking a Staff Software Engineer (Full Stack) to drive the technical success of the platform across multiple squads. You will provide architectural direction, mentor engineers, and champion scalable, secure solutions while leading end-to-end delivery of major initiatives.You will shape the technology strategy, collaborate with Product and Design,...

Model ML is an AI workflow platform transforming how financial institutions automate client-ready processes. We are seeking a highly skilled Full-Stack Engineer with 5+ years of professional experience to join our growing team.You will design and build scalable web applications using React and Next.js, with Python backend services, and contribute to...

Maxwell Bond is seeking a Senior Full Stack Developer to join a fast-moving HealthTech team building a new customer-facing platform using C#/.NET, React and Azure. You'll own significant parts of the backend and frontend, contribute to architecture decisions, and ship deliverables with an API-first approach.You'll work in a remote-first environment with...

Unmind is hiring a Software Engineer (Full Stack) on a 9-month parental leave cover. You will ship features end-to-end for enterprise clients, shaping the product with AI-assisted development using Claude Code.The role spans the stack—TypeScript, React, GraphQL, Node.js, Python, Golang, SQL—and emphasizes reliability, security, and observability. We...

Halian is seeking a Senior Full Stack Shopify Developer to join our fully remote team and deliver Shopify and Shopify Plus solutions for a portfolio of ambitious merchants. You will develop storefronts, apps, and integrations, implement Online Store 2.0 features, and build headless commerce with React, Next.js, Remix, or Hydrogen, while collaborating with...

Citigroup Inc. in London is seeking a hands-on SVP GenAI Full-Stack Engineer Lead to shape engineering culture and deliver AI-powered products. You will provide technical leadership, stay close to code, and collaborate with cross-functional teams to scale developer platforms and drive AI adoption.You will mentor engineers and set direction across frontend,...

Reccreate in London is seeking a top-tier engineer to join a visionary team at the forefront of AI-driven financial modelling. You will build a fast, intuitive UI, tackle complex rendering bugs, and optimise the AI agent’s data handling and context.You’ll own backend improvements, resolve API issues, and scale deployments for speed and reliability. As...

Arva AI is revolutionising financial crime intelligence with cutting-edge AI Agents. As a Senior Full-Stack Product Engineer, you will build and iterate on full-stack features of our AI-powered platform, including document fraud detection and web due diligence, and develop systems to automate testing and model improvements.You will work across front-end,...

Starling Bank is seeking a Full Stack Engineer (ML Ops) in London. Join a fast-moving fintech that values innovation, collaboration and ownership in a hybrid working setup.You will contribute across backend and frontend layers using Java, React and AWS, helping to build scalable services and data-driven features for a modern digital bank. Our team emphasizes...

C3 AI is seeking Forward Deployed Engineers to design, develop, and deploy AI-driven enterprise applications on the C3 AI Platform. You will work directly with customers to deliver production-grade software, demos, and proofs-of-technology, while mentoring teammates and contributing to code quality.An ideal candidate has a STEM background, 2+ years in...

About the Role: FinTech Horizon Ltd is seeking a talented and experienced Senior Full-Stack Developer to join our growing engineering team in London. In this role, you will be responsible for designing, building, and maintaining robust web applications that power our next-generation financial platform. You will work closely with product managers and UI/UX...

Liberty Global Plc seeks a senior platform engineer to design, build and own platform capabilities across frontend, backend, APIs and cloud infrastructure. You will lead architecture reviews, drive scalable and secure designs, and deliver production-grade software from concept to deployment and support.You will evaluate complex technical challenges, guide...

Capgemini Invent in the UK is seeking a Java Full Stack Engineer to join our Digital Excellence team. You will work on cutting-edge digital transformation projects, building microservices with Java/Spring Boot and frontend apps with React in collaborative, agile squads.London, Glasgow or Manchester base with flexible, hybrid assignments. The role offers...